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Journal Article

A Model of Microstructure Evolution in Metals Exposed to Large Strains

Kratochvíl J., Kružík Martin

: Acta Physica Polonica A vol.134, 3 (2018), p. 753-756

: GA17-04301S, GA ČR

: microstructure, large strain

: 10.12693/APhysPolA.134.753

: http://library.utia.cas.cz/separaty/2019/MTR/kratochvil-0507015.pdf

: http://przyrbwn.icm.edu.pl/APP/ABSTR/134/a134-3-31.html

(eng): Crystalline materials at yield behave as anisotropic, highly viscous fluids. A microscopic inspection reveals a structural adjustment of the crystal lattice to the material flow carried by dislocations. The resistance to this flow\ndetermines the strength of ductile materials. The deformation microstructure evolves within a common framework up to very high strains > 100. To avoid energetically costly multislip, materials are subdivided into regions which deform by fewer slip systems. To maintain compatibility, the regions defined as deformation bands occur in a form of elongated alternately misoriented domains filled with fairly equiaxed dislocation cells. In the proposed continuum mechanics model, the formation of deformation bands of a lamellae type is interpreted as a spontaneous deformation instability caused by an anisotropy of hardening. However, such a model of the bands predicts their extreme orientation and their width tends to zero. This trend is opposed by hardening caused by a bowing stress of dislocations within the cells.\n

: BA

: 10101

2019-01-07 08:39